Engine-Codes - Subaru - P0133 Subaru

P0133 Subaru Code - Oxygen Sensor Circuit Slow Response Bank 1 Sensor 1

- Code Popularity: 20,305 Views
- Repair Importance Level: 2/3
- Repair Difficulty Level: 2/3
Table of contents
ChatAC AutoCodes.com AI Chat

What are the Possible Causes of the DTC P0133 Subaru?

NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
  • Faulty Front Heated Oxygen Sensor Bank 1
  • Front Heated Oxygen Sensor Bank 1 harness is open or shorted
  • Front Heated Oxygen Sensor Bank 1 circuit poor electrical connection
  • Inappropriate fuel pressure
  • Faulty fuel injectors
  • Intake air leaks may be faulty
  • Exhaust gas leaks

Code Tech Notes





User Submitted Video

⚠ Does your Subaru have Safety Recalls? → Check here

How to Fix the DTC P0133 Subaru?

Check the 'Possible Causes' listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.

Search for P0133 Subaru Questions and Answers: Search here →

What is the Cost to Diagnose the Code?

Labor: 1.0

The cost to diagnose the P0133 Subaru code is 1.0 hour of labor. The diagnosis time and labor rates at auto repair shops vary depending on the location, make and model of the vehicle, and even the engine type. Most auto repair shops charge between $75 and $150 per hour.

When is the Code Detected?

The response of the voltage signal from the sensor takes more than the specified time.

What are Code Possible Symptoms?

  • Engine Light ON (or Service Engine Soon Warning Light)
  • High Fuel Consumption
  • Excessive Smoke from Exhaust

What Does the P0133 Subaru Code Mean?

This sensor is a Zirconia type sensor, used to monitor exhaust gases for the presence of oxygen. Depending on the level of oxygen in the exhaust stream, the oxygen sensor can inform the Engine Control Module of a rich or lean fuel mixture condition. The Engine Control Module (ECM) will then add or subtract the fuel trim to obtain an ideal mixture. The Diagnostic Trouble Code (DTC) will set when the oxygen sensor voltage signal response time slower than the specified time.

P0133 Subaru Code - Oxygen Sensor Circuit Slow Response Bank 1 Sensor 1

Need more Information on the Code?

Need more information on how to fix the P0133 Subaru code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0133 Subaru code diagnosed by a professional: Find a repair shop in your area